$\int-\left(3x^2-4x\right)\ln\left(x\right)dx$
$25a^2+90at+81t^2$
$xy-y-4x\:=\:5$
$64m^6+\:8$
$2\left(x-1\right)\:+y\left(x-1\right)$
$\left(m^3-m^2+m-2\right)\left(am+a\right)$
$r^2+r-2$
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